Revolving-cutter rotary boring-drill.



Patented Nov. 2, 1915.

f /u/: I

C. E. REED.

REVOLVING CUTTER ROTARY BORING DRILL.

APPLICATION FILED NOV- 27 I914.

. which it appertains to make and use the same CLARENCE EDWARD REED,HOUSTON, TEXAS.

REVOLVING-CUTTER ROTARY BORING-DRILL.

Specification of Letters Patent.

Application filed l lovember 27, 1914. Serial No. 874,338.

To all whom it may concern:

Be it known that I, CLARENCE EDWARD REED, a citizen of the United Statesof America, residin at No. 516 Pacific avenue, in the city of ouston,State of Texas, United States of America, have invented a certain new.and useful Improvement in Revolving-Gutter Rotary Boring-Drills for Usewith the Rotary System Employed in Drilling Wells, and do hereby declarethe nature of this invention, of which the following is a full, clear,and exact description, such as will enable others skilled in the art todrills and particularly to drills ofthat type which are provided withcutters of a flat, circular plate shape.

One object of my invention is to provide a drill of the type referred tohaving cutters of a .Hat circular plate shape so mounts ed that inpractical operation of the drill the friction of the material being cutwill cause the cutters to revolve on their bearings with-v out binding.Binding causes the cutters to wear flat atone spot and renders the drilluseless. I p

Another object is to mount such cutters in the head so that the cutterwill stand-in a vertical plane to the axis of the well being drilled andturn, in practical operation, on a bushing carried by a shaft or pinsupported by the head on both sides of the cutter.

Another object is to so shape the head of the drill that the cuttersrevolving in soft material like gumbo, clay and shale will be cleaned ofthe material sticking to the sides of the cutter as the cutter revolvesin the slotted head.

Another object is to provide a drill head in which the water holes forflushing the waste material can be so placed that the thick mud formedby drilling soft formations cannot enter and clog the passage, causingthe drill to ball up and quit cut-' ting by reason of the materialpacking around the cutters.

Still another object is to provide a very Other objects and desirablefeatures of my invention will be hereinafter pointed out and are shownby the drawings. r v

Figure 1 of the drawings is a part section on the line CD of Fig. 2 anda part bottom plan view of a rotar drill constructed 1n accordance withmy lnvention. Fig. 2 is a side elevational view. Fig. 3 is a verticalsectional View. i

Referring to the drawings which illustrate the preferred form of myinvention, A designates the head which preferably consists of a bar ofmetal, the upper end of which 1 is screw-threaded for connecting thedrill stem or operating member, not shown, through which water isintroduced into the hole .to flush out material cut by the drill. Waterholes in the head are shown at 2.

,These Water holes emerge: one over eachcutter to wash the teeth ofcutter clean, and one at the side of each'cutter, deep in the slot 'backof the washer 5. This location prevents mud in the well clogging theholes,

and also carries ,the water down' so it 1mpinges oncthe material outunder the mass offwaste materialto beflushed out and upward. t V

Cutters B capable of rotation are mounted in the head A so as to cut,disintegrate and crush the material when the drill head is ro- PatentedNov. 2, 1915.

tated, and in the preferred form of m" invention as herein shown thehead of the drill is provided with two cutters that are mounted in thehead in slots 3 cut in parallel planes parallel to the longitudinal axisof the drill head. By mounting the cutters in this manner the shaft orpin supporting the bearing material 4 on which cutters rotate can besupported at both ends by the body of the drill head. This is a verygreat advantage and improvement, .both for strength and to facilitaterevolution of the cutters. Revolution of the cutters is an, absolutenecessity to the success of this type of drill.

The shaft or pin C is lockedin position by set screw 6 and cannot comeout. The

cutters therefore cannot be lost in thewelL' The cutters B are thick andheavy to'successfully withstand the enormous stress set too up inpractical operations. The edges of the cutters are beveled to conform tothe outline of the hole whlch will be concave in that the cutterprojects beyond the metal of the drill head sufiicient to cut ampleclean .ance for the head and the casing or pipe which follows the drill.v

0n the drawings (Fig, 1) 8 indicates the circumference of drill headwhile 9 shows the circumference of hole cut by the drill. The arrowindicates direction of rotation.

In my invention, as shown by the drawings, all parts when assembled arecontained within the drill head. The only parts extending beyond thebody of the head are the heavy cutters B. The shaft or pin C isscrew-threaded its entire length and its head is slotted so it can bescrewed into or out of the head by means of a screwdriver or othersimilar tool. Bushings L of bronze or some other similar material, arepreferably arranged between the cutters and the shaft or pin, andwashers 5 are arranged between the cutters and the'head. 'Dowels l0hold-the washers from turning and wearing'the head.

In the drill shown in Fig. 2 the head is recessed at its upper end asat, ll and this recess is screw-threaded for connecting a lubricantholder, not shown, and ducts '12, 13 and let are formedin the head A,the shafts or pins C, and the bushing 4 to supply a lubricant to thebearing surface of the cutters. j I

My improved drill is very strong, com. pact, of few and simple parts,and can be manufactured at low cost. 'It is very efficient owing to thefact that the'cutters are supported on both sides and only the "sectionactually cutting is in contact with the material and mass of mud andwaste mate rial in the hole, which in all other drills of this classadheres to the cutters and prevents their rotating. As the driller says:It balls up. In pay invention the stresses set up in practical operationare carried to and meet the'bearing surface on a perpendicular line. Thecutters therefore use the friction of contact with bottom of hole toforce their rotation and the enormous weight of the drill stem that isimposed on the cutters also meets the bearing surface of the cutters ona perpendicular line and does not bind the cutters as in drills withinclined spindles.

insane? bottom and side, said slots extending through the outer walls ofthe head at opposite sides of its circumference, a pair of disk shapedcutters independently mounted in said slotswith their cutting edgesextending beyond the circumference of the head, substantially asdescribed.

2.- A rotary boring drill comprising a cy lindrical head, formed with a'pair of parallel vertical slots in its lower end, each of said slotsextending inwardly from the opposite side of its-circumference, saidslots being formed at opposite sides of the longitudinal axis of theboring head, each of said slots being open only at the bottom and at oneSide, a. pair of shafts suitably mounted transversely of said slotsrespectively, and a pair of disk-cutters rotatably mounted on therespective shafts, the cutting edges of saidcutters extending outofsaidslots beyond the circumferential wall of the casing on oppositesides thereof, substantially as described.

3. A rotary boring drill having a single center bearing, two sidebearings having slotsopen only at their bottoms and at one side, saidslots being located between the side bearings and the center bearing,and vertically disposed parallel cutters pivotally mounted in the slotsI 4. 'A rotary boring drill comprising a head formed with a pair ofrecesses therein, each of said recesses being open only at its bottomandf at one side, a pair of cutting disks rotatably mounted in saidrecesses with their cutting edges, extending beyond the outer Wall ofsaid head, said recesses having rear. walls extending back of said diskswith restricted spaces between a portion of the disks and I the rearwalls of the recess, and means for discharging fluid under pressureintosaid restricted spaces onto the cutting disks, the pressure beingmaintained by rea' son of said restrictions ,5. A rotary drillcomprising a head formed with a pair of recesses therein, each of saidrecesses being open only at its bottom and at one side, a pair ofcutting disks rotatably mounted in said recesses, said recesses havingrear walls extending back of said disks with restricted spaces betweena,

I portion of said disks and the rear walls of the recesses, said headhaving passages for directing fluid under maintained pressure pair ofwashers provided at the forward sides of said cutting disks, saidrecesses having rearwalls extending back of said disks with restrictedspaces between a portion of said disksand the rear walls of therecesses,

and means for discharging fluid under yond the outer Wall of said head,said outmaintained pressure into said restricted ters presenting theirfull thickness to the spaces onto the cutting disks. wall of the holebeing cut.

7. A rotary boring drill comprising a In testimony whereof I hereuntoafiix my 5 head formed with a pair of recesses therein, signature in thepresence of two Witnesses, 13

each'of said recesses being open only at its this ninth day of November,1914.

bottom and at one side and formed at op- CLARENCE EDWARD REED. positesides of the head, a pair of frusto- Witnesses:

conical cutters rotatably mounted in said re- R. H. KELLEY,

1-3 cesses with their cutting edges extending be- C. S. POWERS.

